Derivative and Other Financial Instruments and Fair Value Measurements - Assets Measured at Estimated Fair Value on Nonrecurring Basis Based on Fair Value Hierarchy (Detail) - Fair Value, Measurements, Nonrecurring Basis - Level 3 - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
RANA
Assets
Goodwill		$ 33.6
Property, plant and equipment	$ 141.9	195.0
Identifiable intangible assets		12.5
Prepaid Expenses, Supplies, and Other Current Assets | Cosmedicine
Assets
Inventories		$ 0.1